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[" A reversible engine converns onc-rixt...

[" A reversible engine converns onc-rixth of the hear inpork "" when the temperature of the sink is reduced by "],[62^(0)C" ,the efficiency of the engine is doublied.The temperature of the source and sink are "],[[" a) "80^(@)C,37^(@)C," b) "95^(@)C,28^(@)C," c) "90^(@)C,37^(@)C," d) "99^(@)C-23^(@)C]]

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